A high precision underwater acoustic communication channel modeling method

Abstract

The invention discloses a high-precision underwater acoustic communication channel modeling method, which analyzes the influence of sea surface fluctuations on multipath delay and Doppler, and considers this influence in the time-varying channel model of PARASTOO, thereby optimizing its time-varying channel model to achieve high-precision underwater acoustic communication channel modeling without increasing the amount of computation. The first step of the present invention is to construct a channel large-scale variation model, and use the first-order AR process to simulate the random motion of the sound source and the receiver; the second step is to use the bellhop model or the mirror image model to calculate the multipath delay and attenuation information according to the requirements of the simulation environment; The third step is to use an approximate model to analyze the influence of sea surface fluctuation on multipath delay and Doppler according to the sea surface fluctuation data; the fourth step is to analyze the small-scale scattering model; the fifth step is to analyze the Doppler effect of the movement of the transceiver platform; The sixth step is to combine multipath and consider the impact of sea level fluctuations to construct a time-varying channel impulse response.

Description

technical field [0001] The invention relates to the field of acoustics, in particular to an underwater acoustic communication channel modeling technology, mainly a high-precision underwater acoustic communication channel modeling method. Background technique [0002] When constructing an underwater acoustic communication system, the analysis and design of many factors such as the waveform, bandwidth and power of the communication signal need to consider the influence of the underwater acoustic channel. Therefore, a high-precision underwater acoustic channel model is crucial to the construction of a communication system. BELLHOP is a model for analyzing the acoustic pressure field of a waveguide. This model is widely used. It uses ray theory to analyze channel function and propagation loss in the setting of marine environment. However, this model does not consider the time-varying characteristics of actual marine environment parameters. In recent years, time-varying channel...

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Problems solved by technology

Sea level fluctuation is an important factor causing channel time variation, but because the sea level fluctuation period is very short, if the BELLHOP model is repeatedly called to simulate sea level changes, the amount of calculation will be greatly increased, so the PARASTOO method does not consider the sea level fluctuation model in the analysis process , only set a fluctuating velocity for Doppler analysis, without considering the influence of fluctuating height on time delay, etc.

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